香港最晚几点出关:persons who keep watch in the wheat field是什么意思？

persons who keep watch in the wheat field是什么意思？ 求短文 Who to keep fit 谢谢 who invented a lamp to keep miners safe underground who invented a lamp to keep miners safe underground? wat是什么意思 什么是“WAT” persons是什么软件 come in,clever persons. authorized persons only这是什么意思 WAT缺少什么